Welcome to PF;
... is there a special meaning for the capitalization?
Assuming none:

Consider the two planes that do not have k in them - they must intersect along a line right?
What does the third plane have to avoid doing to make all three intersect at a point?

No, no meaning for caps.

I actually did consider them. My problem is, what do I do with that idea? How do I solve k based on that? Like I've tried everything and I'm just about to break because I need to know this. My teacher has never given us a question like this so I feel rather hopeless as much as I love this course.

Welcome to PF;
... is there a special meaning for the capitalization?
Assuming none:

Consider the two planes that do not have k in them - they must intersect along a line right?
What does the third plane have to avoid doing to make all three intersect at a point?

Oh and all three planes when using n1 x n2 • n3 must equal 0 and be coplanar. If it does not equal 0, then it intersects at a single point. Again, I just don't know how to find K. I've tried dot product, linear equations, etc